I think it is the train because it is on wiktionaries only, and it seems like a simple syntax problem that would have happened on a new deployment, but please prove me wrong. If it is not a blocker, at least it is a real bug happening on production right now:
{
"_index": "logstash-2018.03.08",
"_type": "mediawiki",
"_id": "AWIFB9AYruwYJ7-tProw",
"_version": 1,
"_score": null,
"_source": {
"server": "en.wiktionary.org",
"unique_id": "WqEIJApAMFYAAF6Po-4AAAAS",
"level": "WARNING",
"ip": "10.64.0.102",
"wiki": "enwiktionary",
"channel": "DBQuery",
"mwversion": "1.31.0-wmf.24",
"message": "Wikimedia\\Rdbms\\Database::selectSQLText called from IndexPager::buildQueryInfo (SecurePoll_ElectionPager) with incorrect parameters: $conds must be a string or an array",
"type": "mediawiki",
"normalized_message": "Wikimedia\\Rdbms\\Database::selectSQLText called from IndexPager::buildQueryInfo (SecurePoll_ElectionPager) with incorrect parameters: $conds must be a string or an array",
"url": "/wiki/Special:SecurePoll",
"tags": [
"syslog",
"es",
"es"
],
"reqId": "WqEIJApAMFYAAF6Po-4AAAAS",
"referrer": "https://en.wiktionary.org/wiki/Wiktionary:Requests_for_deletion/English",
"@timestamp": "2018-03-08T09:53:40.000Z",
"http_method": "GET",
"@version": 1,
"host": "mw1251",
"shard": "s2"
},
"fields": {
"@timestamp": [
1520502820000
]
},
"sort": [
1520502820000
]
}